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Process for producing periodicity field reverse of Gd2 (MoO4)3 crystal

A technology of domain inversion and periodicity, which is applied in the field of periodic domain inversion of Gd23 crystals, can solve the problems of low accuracy and inability to realize periodic phase matching of micro-regions, and achieve the effect of quasi-phase matching

Inactive Publication Date: 2006-06-14
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Their disadvantage is that they cannot achieve periodic phase matching of micro-regions (only on the order of microns), and the accuracy is not very high.

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  • Process for producing periodicity field reverse of Gd2 (MoO4)3 crystal

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Embodiment Construction

[0024] figure 1 Is this invention realizes Gd 2 (MoO 4 ) 3 Schematic diagram of the laser system of the method of crystal periodic domain inversion. The present invention uses femtosecond laser to realize Gd 2 (MoO 4 ) 3 The specific process flow of single crystal periodic domain inversion is as follows:

[0025] First, Gd 2 (MoO 4 ) 3 The single crystal is oriented, and the Gd is perpendicular to the direction of [001] 2 (MoO 4 ) 3 Cut into a single wafer with a certain thickness, and after polishing (the smoothness is greater than level III), perform a single domain treatment by annealing, and the crystal annealing temperature is 870±20°C;

[0026] Optical path adjustment, pass the Ti:Sapphire femtosecond laser through the beam splitter, split into two laser beams, and then focus through the lens to achieve 9-11J / cm 2 By adjusting the incident angle between the two beams, the width of interference fringes can be adjusted;

[0027] Place the single wafer processed by at the fo...

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Abstract

A realization of Gd 2 (MoO 4 ) 3 A method for crystal periodic domain inversion, which is characterized in that the Gd 2 (MoO 4 ) 3 The crystal plate is polished along the polarization direction (001), and the ultra-strong and ultra-fast laser is divided into two beams with a sub-wave plate, and the distance between the interference fringes is changed by adjusting the incident angle of the laser beam. Under the action of , the periodic inversion of the domain is realized. The preparation process of the periodic domain structure of the present invention is simple, easy to operate, accurate in size, low in cost, and convenient for rapid and large-scale production. The nonlinear optical crystal with this structure is suitable for high-energy frequency-doubled laser output.

Description

Technical field [0001] The present invention and gadolinium molybdate (hereinafter referred to as Gd 2 (MoO 4 ) 3 ) Crystal-related, especially one that realizes Gd 2 (MoO 4 ) 3 Method of periodic domain inversion of crystals. The periodic domain reversal of the crystal can be used for frequency-doubled output of laser. Background technique [0002] In 1962, Bloembergen et al. proposed the quasi phase matching (QPM) theory: the periodic modulation (periodic domain inversion) of the nonlinear polarizability of the crystal is used to compensate for the fundamental wave and the fundamental wave caused by refractive index dispersion. The phase mismatch between the harmonics has been enhanced by nonlinear optical effects. Substituting microstructured materials for uniform materials and using QPM to increase the conversion efficiency of laser frequency doubling is technically attractive. Using crystal periodic domain inversion to achieve quasi-phase matching has a series of major advan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B33/00C30B29/32
Inventor 姜本学潘守夔赵志伟徐军张连翰
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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